Materials that change shape or dimensions in response to external stimuli are widely used in actuation devices. While plenty of systems respond to heat, light, electricity, and magnetism, there is an emerging class of light-driven actuators based...

"In his own art […] Stieglitz had moved quite sharply away from the pictorialism of his early work toward ever-more 'straight' photography - that is, toward photographs that look like photographs, free of lens or darkroom manipulations...